If you like Hellvetron, give Wrathprayer a listen, if you haven't already done so._________________"Beating up wife and children.....well at least a little bit more evil than ex-bandcomrade Blackmoon who only GOT beaten up by an elk."

Temple Nightside and Ill Omen. While not quite being Doom/Death, give off that very Dark, reverb drenched sound similar to Hellvetron and Encoffination. Every time I hear Temple Nightside it reminds me of the Hellvetron sound.
Muknal as well, that dark, lurching reverb ridden sound. Obviously not totally Doom, but I would argue it gives off a similar feeling.